/* roulang page: index */
/* ==========================================================================
       设计系统核心变量与基础重置 (极简高端风 + 科技绿动感点睛)
       ========================================================================== */
    :root {
      --bg-canvas: #f8fafc;
      --bg-subtle: #f1f5f9;
      --bg-dark: #0b0f17;
      --bg-card-dark: #131b2a;
      --bg-card-dark-hover: #1a2538;
      --text-main: #0f172a;
      --text-secondary: #475569;
      --text-light: #f8fafc;
      --text-muted: #94a3b8;
      --accent-green: #00e676;
      --accent-green-hover: #00c853;
      --accent-green-soft: rgba(0, 230, 118, 0.12);
      --accent-blue: #0ea5e9;
      --border-subtle: rgba(15, 23, 42, 0.08);
      --border-dark: rgba(255, 255, 255, 0.12);
      --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 14px;
      --shadow-subtle: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-float: 0 16px 32px -8px rgba(15, 23, 42, 0.08);
      --transition-standard: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-display);
      background-color: var(--bg-canvas);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-standard);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* ==========================================================================
       排版节奏与工具类
       ========================================================================== */
    .section-eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.78rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.12em;
      color: var(--accent-green);
      background-color: rgba(0, 230, 118, 0.08);
      border: 1px solid rgba(0, 230, 118, 0.25);
      padding: 4px 12px;
      border-radius: 999px;
      margin-bottom: 1rem;
    }

    .section-eyebrow.dark-badge {
      background-color: rgba(0, 230, 118, 0.15);
      color: #00e676;
    }

    .section-title {
      font-size: clamp(1.8rem, 3.2vw, 2.5rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.25;
      margin-bottom: 1rem;
      color: var(--text-main);
    }

    .section-title.text-white {
      color: #ffffff;
    }

    .section-subtitle {
      font-size: clamp(0.95rem, 1.2vw, 1.05rem);
      color: var(--text-secondary);
      line-height: 1.75;
      max-width: 720px;
      margin-bottom: 2.5rem;
    }

    .section-subtitle.text-muted-dark {
      color: #94a3b8;
    }

    .mono-num {
      font-family: "DIN Alternate", "Roboto Mono", "PingFang SC", sans-serif;
      font-weight: 800;
    }

    .pulse-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background-color: var(--accent-green);
      border-radius: 50%;
      box-shadow: 0 0 0 0 rgba(0, 230, 118, 0.7);
      animation: pulseAnimation 2s infinite;
    }

    @keyframes pulseAnimation {
      0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 230, 118, 0.7); }
      70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(0, 230, 118, 0); }
      100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 230, 118, 0); }
    }

    /* 按钮重置与定制 */
    .btn-brand-primary {
      background-color: var(--text-main);
      color: #ffffff;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 24px;
      border-radius: 999px;
      border: 1px solid var(--text-main);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition-standard);
    }

    .btn-brand-primary:hover {
      background-color: #000000;
      color: var(--accent-green);
      border-color: #000000;
      transform: translateY(-2px);
    }

    .btn-brand-accent {
      background-color: var(--accent-green);
      color: #0b0f17;
      font-weight: 700;
      font-size: 0.95rem;
      padding: 10px 24px;
      border-radius: 999px;
      border: 1px solid var(--accent-green);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition-standard);
    }

    .btn-brand-accent:hover {
      background-color: #00c853;
      color: #000;
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(0, 230, 118, 0.3);
    }

    .btn-brand-outline {
      background-color: transparent;
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 24px;
      border-radius: 999px;
      border: 1px solid var(--border-subtle);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition-standard);
    }

    .btn-brand-outline:hover {
      background-color: #ffffff;
      border-color: var(--text-main);
      color: var(--text-main);
      transform: translateY(-2px);
    }

    .btn-brand-outline-light {
      background-color: transparent;
      color: #ffffff;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 24px;
      border-radius: 999px;
      border: 1px solid var(--border-dark);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition-standard);
    }

    .btn-brand-outline-light:hover {
      background-color: rgba(255, 255, 255, 0.08);
      border-color: #ffffff;
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* ==========================================================================
       极简高端双行导航体系
       ========================================================================== */
    .top-telemetry-bar {
      height: 38px;
      background-color: #0b0f17;
      color: #94a3b8;
      font-size: 0.78rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      align-items: center;
    }

    .top-telemetry-bar a {
      color: #cbd5e1;
    }

    .top-telemetry-bar a:hover {
      color: var(--accent-green);
    }

    .site-navbar {
      height: 72px;
      background-color: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
      position: sticky;
      top: 0;
      z-index: 1020;
      transition: var(--transition-standard);
    }

    .navbar-brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.25rem;
      color: var(--text-main);
      letter-spacing: -0.01em;
    }

    .logo-node-badge {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, #0b0f17 0%, #1e293b 100%);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-green);
      font-size: 1rem;
      border: 1px solid rgba(0, 230, 118, 0.3);
    }

    .nav-link-custom {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 6px 14px;
      position: relative;
    }

    .nav-link-custom:hover,
    .nav-link-custom.active {
      color: var(--text-main);
      font-weight: 600;
    }

    .nav-link-custom::after {
      content: "";
      position: absolute;
      bottom: -2px;
      left: 14px;
      right: 14px;
      height: 2px;
      background-color: var(--accent-green);
      transform: scaleX(0);
      transition: transform 0.25s ease;
    }

    .nav-link-custom:hover::after,
    .nav-link-custom.active::after {
      transform: scaleX(1);
    }

    /* ==========================================================================
       各板块基础结构统一
       ========================================================================== */
    .site-section {
      padding: 96px 0;
      position: relative;
    }

    .site-section-sm {
      padding: 64px 0;
    }

    .section-border-top {
      border-top: 1px solid var(--border-subtle);
    }

    .bg-dark-stage {
      background-color: var(--bg-dark);
      color: #ffffff;
    }

    .bg-dark-stage .section-border-top {
      border-top: 1px solid var(--border-dark);
    }

    /* ==========================================================================
       板块 1: 首屏 Hero 架构
       ========================================================================== */
    .hero-banner-section {
      position: relative;
      background-color: #0b0f17;
      color: #ffffff;
      padding: 100px 0 110px 0;
      overflow: hidden;
      background-image: linear-gradient(rgba(11, 15, 23, 0.88), rgba(11, 15, 23, 0.95)), url('/assets/images/de5fa7cf63b590b1.jpg');
      background-size: cover;
      background-position: center;
    }

    .hero-title {
      font-size: clamp(2.3rem, 4.4vw, 3.6rem);
      font-weight: 900;
      line-height: 1.15;
      letter-spacing: -0.03em;
      margin-bottom: 1.5rem;
    }

    .hero-desc {
      font-size: clamp(1rem, 1.25vw, 1.15rem);
      color: #cbd5e1;
      line-height: 1.85;
      margin-bottom: 2.2rem;
      max-width: 640px;
    }

    .hero-glass-card {
      background: rgba(19, 27, 42, 0.75);
      border: 1px solid rgba(255, 255, 255, 0.12);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
    }

    .telemetry-preview-img {
      height: 250px;
      object-fit: cover;
      width: 100%;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .metric-badge-row {
      display: flex;
      gap: 12px;
      padding: 16px 20px;
      background: rgba(11, 15, 23, 0.6);
    }

    /* ==========================================================================
       板块 2: 架构分层切片卡片
       ========================================================================== */
    .arch-step-card {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 28px 22px;
      height: 100%;
      position: relative;
      transition: var(--transition-standard);
    }

    .arch-step-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 230, 118, 0.5);
      box-shadow: var(--shadow-float);
    }

    .arch-step-icon {
      font-size: 1.8rem;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    /* ==========================================================================
       板块 3: 核心优势矩阵
       ========================================================================== */
    .adv-feature-card {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 32px 26px;
      height: 100%;
      position: relative;
      transition: var(--transition-standard);
      overflow: hidden;
    }

    .adv-feature-card:hover {
      transform: translateY(-4px);
      border-color: var(--accent-green);
      box-shadow: var(--shadow-float);
    }

    .adv-index-num {
      position: absolute;
      top: 18px;
      right: 22px;
      font-size: 2rem;
      font-weight: 900;
      color: rgba(15, 23, 42, 0.06);
      line-height: 1;
    }

    /* ==========================================================================
       板块 4: 产品矩阵大卡片
       ========================================================================== */
    .product-stage-card {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      overflow: hidden;
      height: 100%;
      display: flex;
      flex-direction: column;
      transition: var(--transition-standard);
    }

    .product-stage-card:hover {
      transform: translateY(-5px);
      border-color: rgba(0, 230, 118, 0.6);
      box-shadow: var(--shadow-float);
    }

    .product-stage-thumb {
      height: 220px;
      object-fit: cover;
      width: 100%;
      background-color: #0b0f17;
    }

    .product-stage-body {
      padding: 28px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .tech-spec-tag {
      font-size: 0.78rem;
      background: var(--bg-subtle);
      color: var(--text-secondary);
      padding: 4px 10px;
      border-radius: 4px;
      display: inline-block;
      margin-right: 6px;
      margin-bottom: 6px;
      border: 1px solid rgba(15, 23, 42, 0.05);
    }

    /* ==========================================================================
       板块 5: 工作流交错时间轴
       ========================================================================== */
    .workflow-timeline-item {
      padding: 24px 0;
      border-left: 2px solid var(--border-subtle);
      padding-left: 28px;
      position: relative;
    }

    .workflow-timeline-item::before {
      content: "";
      position: absolute;
      left: -7px;
      top: 30px;
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: #ffffff;
      border: 3px solid var(--text-main);
    }

    .workflow-timeline-item.active::before {
      border-color: var(--accent-green);
      background: var(--accent-green);
    }

    /* ==========================================================================
       板块 6: 沉浸式深色实战案例墙
       ========================================================================== */
    .dark-case-card {
      background: var(--bg-card-dark);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 32px 26px;
      height: 100%;
      transition: var(--transition-standard);
    }

    .dark-case-card:hover {
      background: var(--bg-card-dark-hover);
      border-color: var(--accent-green);
      transform: translateY(-4px);
    }

    /* ==========================================================================
       板块 7: 用户决策实录
       ========================================================================== */
    .story-bubble-card {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 36px;
      height: 100%;
      box-shadow: var(--shadow-subtle);
    }

    /* ==========================================================================
       板块 8: 实时算力数据大板
       ========================================================================== */
    .stat-metric-card {
      text-align: center;
      padding: 36px 20px;
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
    }

    .stat-giant-num {
      font-size: clamp(2.4rem, 4vw, 3.8rem);
      color: var(--accent-green);
      line-height: 1.1;
      margin-bottom: 8px;
    }

    /* ==========================================================================
       板块 9: 评价引用网格
       ========================================================================== */
    .quote-modern-card {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 30px;
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition-standard);
    }

    .quote-modern-card:hover {
      border-color: rgba(15, 23, 42, 0.2);
      box-shadow: var(--shadow-float);
    }

    /* ==========================================================================
       板块 10: 资讯卡片
       ========================================================================== */
    .news-digest-card {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      overflow: hidden;
      height: 100%;
      display: flex;
      flex-direction: column;
      transition: var(--transition-standard);
    }

    .news-digest-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-float);
      border-color: rgba(0, 230, 118, 0.5);
    }

    .news-digest-thumb {
      height: 190px;
      object-fit: cover;
      width: 100%;
    }

    .news-digest-content {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    /* ==========================================================================
       板块 11: 生态合作网格
       ========================================================================== */
    .partner-grid-badge {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      padding: 22px 16px;
      text-align: center;
      border-radius: var(--radius-md);
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-secondary);
      transition: var(--transition-standard);
    }

    .partner-grid-badge:hover {
      border-color: var(--accent-green);
      color: var(--text-main);
      box-shadow: var(--shadow-subtle);
    }

    /* ==========================================================================
       板块 12: 多端矩阵
       ========================================================================== */
    .terminal-support-card {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 26px;
      text-align: center;
      transition: var(--transition-standard);
    }

    .terminal-support-card:hover {
      border-color: var(--text-main);
      transform: translateY(-3px);
    }

    /* ==========================================================================
       板块 13: FAQ 手风琴
       ========================================================================== */
    .custom-faq-accordion .accordion-item {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md) !important;
      margin-bottom: 14px;
      overflow: hidden;
    }

    .custom-faq-accordion .accordion-button {
      background-color: #ffffff;
      color: var(--text-main);
      font-weight: 700;
      font-size: 1.05rem;
      padding: 20px 24px;
      box-shadow: none;
    }

    .custom-faq-accordion .accordion-button:not(.collapsed) {
      color: var(--text-main);
      background-color: rgba(0, 230, 118, 0.05);
      border-bottom: 1px solid var(--border-subtle);
    }

    .custom-faq-accordion .accordion-body {
      padding: 22px 24px;
      color: var(--text-secondary);
      line-height: 1.8;
      font-size: 0.96rem;
    }

    /* ==========================================================================
       板块 14: 咨询转化表单
       ========================================================================== */
    .contact-card-wrap {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-float);
    }

    .form-control-custom,
    .form-select-custom {
      border: 1px solid rgba(15, 23, 42, 0.15);
      border-radius: 6px;
      padding: 12px 16px;
      font-size: 0.95rem;
      color: var(--text-main);
      transition: var(--transition-standard);
    }

    .form-control-custom:focus,
    .form-select-custom:focus {
      outline: none;
      border-color: var(--text-main);
      box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.08);
    }

    /* ==========================================================================
       页脚体系
       ========================================================================== */
    .site-footer {
      background-color: #0b0f17;
      color: #94a3b8;
      font-size: 0.9rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 80px 0 30px 0;
    }

    .footer-col-title {
      color: #ffffff;
      font-weight: 700;
      font-size: 1rem;
      margin-bottom: 1.5rem;
      letter-spacing: -0.01em;
    }

    .footer-link-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .footer-link-list li {
      margin-bottom: 10px;
    }

    .footer-link-list a {
      color: #94a3b8;
    }

    .footer-link-list a:hover {
      color: var(--accent-green);
    }

    .sub-footer-bar {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 30px;
      margin-top: 60px;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 移动端菜单与适配 */
    @media (max-width: 991.98px) {
      .site-section {
        padding: 64px 0;
      }
      .top-telemetry-bar {
        display: none;
      }
      .hero-banner-section {
        padding: 60px 0 80px 0;
      }
      .contact-card-wrap {
        padding: 26px;
      }
    }